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Dual Behavior of ZSM-5 as Brønsted Acid and Electron Acceptor in the Adsorption of N,N′-Diphenylhydrazine

✍ Scribed by Vicente Martí; Vicente Fornés; Hermenegildo García; Heinz Dieter Roth

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 247 KB
Volume: 2000
Category: Article
ISSN: 1434-193X
DOI: 10.1002/(sici)1099-0690(200002)2000:3<473::aid-ejoc473>3.0.co;2-n

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✦ Synopsis

Incorporation of N,NЈ-diphenylhydrazine into HZSM-5 led to the formation of azobenzene and aniline (70Ϫ80 mol-% mass balance). The formation of azobenzene can be followed by the appearance in diffuse reflectance UV/Vis spectroscopy of a characteristic band (λmax = 420 nm). IR spectra of the extracted solids indicate that some aniline is retained in the zeolite, probably due to acid-base interaction with active sites. The products are rationalized by two competing mechanisms: the formation of azobenzene by electron [a]

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